Adult echinoderms have five-point radial symmetry and include sea stars, sea urchins, and sea cucumbers. They are the largest phylum that has no freshwater or terrestrial (land-based) representatives.
Sea starsCushion star, Culcita novaeguineae
Pinkish sea cucumber, Holothuria edulis
Grinding sea urchin, Echinostrephus molaris
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Last modified 4 November 2019